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Krypto has the resetting of the combination lock on their website (under Maintenance) but if you cannot unlock it in the first place you can not reset the combination. You have to know the old combination to get it open.

Try this....My new lock didn't come with any instuctions. I followed the link above
and located the "bike locks" heading. I found that the question:

- I have a Kryptonite resettable combination lock and can't find the
instructions for resetting it. How can I change the combination?

contained a pdf titled :

- Resettable Combination Cable(red reset buttons inside)

which is not the cryptoflex 1218 but is compatible anyway.

dont
hurt your fingers trying to depress the nodules as the diagram says
though. to my chagrin i discovered that they will turn easily if you
just push them around into place.

here are the instructions:

To set your own combinationYour new lock is preset to open at 0-0-0-5 at the factory.1. Open the lock by aligning the opening combinationnumber to the Guide Points and pull out the LockPost. (Figure 1)2. Push down the two Reset Buttons simultaneouslywith thumb and forefinger, and turn counterclockwiseuntil it comes to a stop. (Figure 2)3.You are now ready to turn the dials to set yoursecret combination, such as a phone number, birthday,etc.4. After setting your secret combination, turn thetwo Reset Buttons again by Thumb and Forefingerclockwise until it comes to a stop and back to itsoriginal position.5. Verify your new combination before using yourlock. Insert the Lock Post all the way into the LockingPort but do not turn the dials. Pull out the Lock Post.Your lock is ready to use.6.The reset operation is now complete. Repeatsteps 1-5 anytime you wish to change your secretcombination.